I think you could use a double santee, but better would be that double fixture fitting that you mentioned. Use a 2x2x2x2 and reduce for the tub somewhere along the line... maybe at the trap, or even at the double fixture fitting.Makes sense. How about using a tee in the image i attached?
Too many turns in the trap arm. Cant exceed 90 degrees without a cleanout on a trap arm with 2" pipe or less.
Can i vent a shower and a bathtub on the same 1.5" vent? I have a back to back shower/tub currently and i am remodeling the shower side. I am hoping i can combine the vents for each into one. Something like the image attached? Thanks!
You could have stacked your fixtures like you had in your original drawing. Either way code says you need a 2" drain.
Both San-tees need to be 2" because one is a vent for the other. if you want super fast drains use 2" p-traps and drains on both. I would put the shower on top. What you have is a common vent / vertical wet vent. Perfectly legal.
Finally got to it. Used a T-Waste drain on the tub and it can now handle the full flow from the faucet.
View attachment 59434
This is awkward, but...
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